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https://web.archive.org/web/20190508021859/https://twitter.com/davecheney/status/942593128355192832
This one works.
Go doesn't have covariance/contravariance or auto casting between identical interfaces.
What it means in context of using interfaces in the package of invocation is that if you have a local interface Handler
that uses another local interface, Message
it cannot be implemented without importing the Message
, and different callers cannot have different interfaces.
type Message interface {
GetText() string
}
type Handler interface {
Handle(msg Message)
}
More to that, if the local interface if not exported (i.e. message
, lowercase) it cannot be implemented at all outside of the package.
The only solution I see is to have a common "interface" package and use it in both places, which this article is against.
So the question is โ what would you propose in that case?
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